For security purposes, Paypal enforces initial limits on the amount you can Cash In per period or per transaction. Until you can complete the steps required by Paypal to remove the sending or withdrawal limit, you will not be able to Cash In as frequently or as much as you would want. You may reach out to Paypal support to ask for more details about the Paypal account sending/withdrawal limits and the steps to remove the limits in your Paypal account.